Mathematical Constants

The Math and StrictMath classes provide the two transcendental number constants. The first is Euler's number, e ; that is, the base for natural logarithms. The second constant is the fundamental trigonometric constant p that is the ratio of the circumference of a circle to its diameter.

   public  static  final  double  E
   
   public  static  final  double  PI

E is Euler's number, the base of natural logarithms

PI is the ratio of the circumference of a circle to its diameter.